Hanna Marine Magnesium Checker - HI783

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The first Magnesium test of its kind for saltwater aquariums, our Marine Magnesium Checker® HC (HI783) is just what every reef tank owner needs. Struggling with test kits is now a thing of the past. Stop guessing or interpreting a color change by eye. Get a fast, accurate digital read-out every time. 

Perfect for testing and measuring Magnesium levels in saltwater aquariums, reef tanks, and other marine and aquaculture applications.

  • Easy-to-read, instant digital results
  • Small, convenient portable size
  • User-friendly, simple directions and steps
  • Saltwater compatible  
  • Dedicated to a single parameter 
  • Range: 1000 to 1800 ppm Magnesium 
  • Determines the concentration of Magnesium colorimetrically using the Beer-Lambert Principle 
  • One-button operation  
  • A great alternative to chemical test kits  
  • Color-coded syringes for hassle-free testing  
  • Auto shut-off conserves battery energy 
  • Large LCD screen with digital read-out


Uses HI783-11 Calibration Check Set & HI783-25 Reagents.